About CVSZilla
CVSZilla is a collection of Perl scripts that integrate CVS with BugZilla and ViewVC. It also extends CVS to support rudimentary change-sets (a.k.a. "transactions").
CVSZilla was once hosted at http://www.cvszilla.org/, but the registration for that site seems to have lapsed. Versions supporting Bugzilla 2.18 and newer were once available there, but for now, all I have available are older versions:
CVSZilla 2.0 beta1, for use with Bugzilla 2.12 and newer
CVSZilla 1.0 beta1, for use with Bugzilla 2.8 through 2.10